Someone says “it’s like a 7,” someone else says “same,” and then on turn four a player casts three spells that cost zero mana and the table learns what “7” means in that person’s heart.… 

You can build the cleanest 99 in the world and still lose on Turn 0 if your opening hand doesn’t actually play Magic. In Commander, mulligans are less about finding “the nuts” and more about…